Nickel(ii)-ethylenediamine tetraacetic acid sensitized silicon nanowire array: an efficient cocatalyst-free photocatalyst for photocatalytic hydrogen generation under simulated sunlight irradiation

The nickel(ii)-ethylenediamine tetraacetic acid sensitized silicon nanowire array was prepared. The as-prepared photocatalytic system possesses high activity for photocatalytic H2 evolution under sunlight irradiation.

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Synergy of the Combination of Titanate Nanotubes with Titania Nanoparticles for the Photocatalytic Hydrogen Generation from Water-Methanol Mixture Using Simulated Sunlight

International Journal of Photoenergy ◽

10.1155/2014/426797 ◽

2014 ◽

Vol 2014 ◽

pp. 1-6

Author(s):

Marco Serra ◽

Hermenegildo Garcia

Keyword(s):

Hydrogen Generation ◽

Titanium Dioxide Nanoparticles ◽

Titanate Nanotubes ◽

Titania Nanoparticles ◽

Simulated Sunlight ◽

Visible Absorption ◽

Sunlight Irradiation ◽

Photocatalytic Hydrogen Generation ◽

Commercial Titanium ◽

Alkali Digestion

Alkali digestion of titanium nanoparticles leads, after neutralization, to the formation of titanate nanotubes with long aspect ratio. One salient change in the formation of titanate nanotubes is the observation of an extended visible absorption band up to 550 nm, responsible for their brown colour. Combination of titanate nanotubes with commercial titanium dioxide nanoparticles, either Evonik P25 or Millennium PC500, results in an enhanced photocatalytic activity for hydrogen generation from water-methanol mixtures. This synergy between the two titanium semiconductors has an optimum for a certain proportion of the two components and is observed in both the absence and the presence of platinum or gold nanoparticles. The best efficiency under simulated sunlight irradiation was for a combination of 12 wt.% titanate nanotubes containing 0.32 wt.% platinum in 88 wt.% Millennium PC500, where a two-time increase in the hydrogen generation is observed versus the activity of Millennium PC500 containing platinum. This synergy is proposed to derive from the interfacial electron transfer from titanate nanotubes undergoing photoexcitation at wavelengths in which Millennium PC500 does not absorb this form of titania nanoparticles. Our results illustrate how the combination of several titanium semiconductors can result in an enhancement efficiency with respect to their individual components.

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Novel Assembly of an MoS2Electrocatalyst onto a Silicon Nanowire Array Electrode to Construct a Photocathode Composed of Elements Abundant on the Earth for Hydrogen Generation

Chemistry - A European Journal ◽

10.1002/chem.201202214 ◽

2012 ◽

Vol 18 (44) ◽

pp. 13994-13999 ◽

Cited By ~ 85

Author(s):

Phong D. Tran ◽

Stevin S. Pramana ◽

Vinayak S. Kale ◽

Mai Nguyen ◽

Sing Yang Chiam ◽

...

Keyword(s):

Hydrogen Generation ◽

Silicon Nanowire ◽

Nanowire Array ◽

The Earth ◽

Array Electrode ◽

Silicon Nanowire Array

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Solution-phase synthesis of γ-In2Se3 nanoparticles for highly efficient photocatalytic hydrogen generation under simulated sunlight irradiation

RSC Advances ◽

10.1039/c6ra21784b ◽

2016 ◽

Vol 6 (108) ◽

pp. 106671-106675 ◽

Cited By ~ 11

Author(s):

Shuang Yang ◽

Cheng-Yan Xu ◽

Li Yang ◽

Sheng-Peng Hu ◽

Liang Zhen

Keyword(s):

Hydrogen Generation ◽

Triethylene Glycol ◽

Indium Selenide ◽

Solution Phase ◽

Simulated Sunlight ◽

Sunlight Irradiation ◽

Phase Synthesis ◽

Photocatalytic Hydrogen Generation ◽

Solution Phase Synthesis ◽

Hot Injection

Hexagonal indium selenide (In2Se3) nanoparticles were successfully synthesized by a hot-injection method using triethylene glycol as solvent, which have superior and stable photocatalytic hydrogen generation under simulated sunlight irradiation.

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Reusable Surface-Enhanced Raman Spectroscopy Substrates Made of Silicon Nanowire Array Coated with Silver Nanoparticles Fabricated by Metal-Assisted Chemical Etching and Photonic Reduction

Nanomaterials ◽

10.3390/nano9111531 ◽

2019 ◽

Vol 9 (11) ◽

pp. 1531 ◽

Cited By ~ 2

Author(s):

Shi Bai ◽

Yongjun Du ◽

Chunyan Wang ◽

Jian Wu ◽

Koji Sugioka

Keyword(s):

Silver Nanoparticles ◽

Chemical Etching ◽

Silicon Nanowire ◽

Nanowire Array ◽

Surface Enhanced Raman Spectroscopy ◽

Sers Substrate ◽

Silicon Nanowire Array ◽

Surface Enhanced ◽

Surface Enhanced Raman ◽

Metal Assisted Chemical Etching

Surface-enhanced Raman spectroscopy (SERS) has advanced over the last four decades and has become an attractive tool for highly sensitive analysis in fields such as medicine and environmental monitoring. Recently, there has been an urgent demand for reusable and long-lived SERS substrates as a means of reducing the costs associated with this technique To this end, we fabricated a SERS substrate comprising a silicon nanowire array coated with silver nanoparticles, using metal-assisted chemical etching followed by photonic reduction. The morphology and growth mechanism of the SERS substrate were carefully examined and the performance of the fabricated SERS substrate was tested using rhodamine 6G and dopamine hydrochloride. The data show that this new substrate provides an enhancement factor of nearly 1 × 108. This work demonstrates that a silicon nanowire array coated with silver nanoparticles is sensitive and sufficiently robust to allow repeated reuse. These results suggest that this newly developed technique could allow SERS to be used in many commercial applications.

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